<template>
  <div>
    <table border="1" width="700" style="border-collapse: collapse">
      <caption>
        购物车
      </caption>
      <thead>
        <tr>
          <th><input v-model="flag" type="checkbox" /> <span>全选</span></th>
          <th>名称</th>
          <th>价格</th>
          <th>数量</th>
          <th>总价</th>
          <th>操作</th>
        </tr>
      </thead>
      <tbody>
        <shopping 
        v-for="(item ,index) in goodList" 
        :key="index"
        :item="item"
        :index="index"
        @del="delHandler"
        ></shopping>
      </tbody>
      <tfoot>
        <tr>
          <td>合计:</td>
          <td colspan="5">{{ sum }}</td>
        </tr>
      </tfoot>
    </table>
  </div>
</template>

<script>
import shopping from './components/shopping.vue'

export default {
  components: {
    shopping
  },
  data() {
    return {
      goodList: [
        {
          name: "诸葛亮",
          price: 1000,
          num: 1,
          checked: false,
        },
        {
          name: "蔡文姬",
          price: 1500,
          num: 1,
          checked: false,
        },
        {
          name: "妲己",
          price: 2000,
          num: 1,
          checked: false,
        },
        {
          name: "鲁班",
          price: 2200,
          num: 1,
          checked: false,
        },
      ],
    };
  },
  methods: {
    delHandler(index) {
      this.goodList.splice(index,1)
    }
  },
  computed: {
    flag: {
      set(val) {
        this.goodList.forEach(item => item.checked = val)
      },
      get() {
        return this.goodList.every(item => item.checked)
      }
    },
    sum() {
      let sum = 0
      this.goodList.forEach(item => sum += item.num * item.price)
      return sum
    }
  }
};
</script>

<style>
</style>